Malicious PDF — malware analysis report

Static analysis result for SHA-256 35549698cd57b22e…

MALICIOUS

PDF

46.4 KB Created: 2021-06-02 22:11:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 21e32f7937a8539e83fdd34cd4e3b1cc SHA-1: 6cbe994b312ab3061472fd0d372817da0d3f2a0c SHA-256: 35549698cd57b22ecc7b997abe6fe22d9e4a29b322a21d4fc07d099178ad48ff
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF that displays a fake CAPTCHA, a common social engineering tactic to trick users into interacting with malicious content. It contains an embedded URI pointing to a URL that promises free items in a game, further reinforcing the lure. The ML classifier also flagged this PDF as malicious with high confidence. The presence of a fake CAPTCHA and a call-to-action URL suggests the document is designed to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 4

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.xyz/app/431946152/how-to-get-free-stuff-in-roblox-dragon-riders-game-hack
    • http://www.vermaagri.com/uploaded_files/userfiles/files/rbx-land-free-robux_GM431946152.pdf
    • http://www.vermaagri.com/uploaded_files/userfiles/files/get-free-coin-master-coins_GM406889139.pdf
    • http://www.vermaagri.com/uploaded_files/userfiles/files/free-links-for-free-coins-and-spins-for-coin-master_GM406889139.pdf
    • http://vermaagri.com/uploaded_files/userfiles/files/free-spins-on-coin-master-without-human-verification_GM406889139.pdf
    • http://vermaagri.com/uploaded_files/userfiles/files/roblox-hacks-com_GM431946152.pdf
    • http://www.vermaagri.com/uploaded_files/userfiles/files/free-spin-coin-master-instagram_GM406889139.pdf
    • http://vermaagri.com/uploaded_files/userfiles/files/free-minecraft-mods-for-ps4_GM479516143.pdf
    • http://vermaagri.com/uploaded_files/userfiles/files/coin-master-free-spins-1-coin-master_GM406889139.pdf
    • http://www.vermaagri.com/uploaded_files/userfiles/files/roblox-hack-generator_GM431946152.pdf
    • http://www.vermaagri.com/uploaded_files/userfiles/files/coin-master-hack-xyz-download_GM406889139.pdf
    • http://vermaagri.com/uploaded_files/userfiles/files/free-daily-coin-master-coins_GM406889139.pdf
    • http://vermaagri.com/uploaded_files/userfiles/files/get-free-robux-com_GM431946152.pdf
    • http://www.vermaagri.com/uploaded_files/userfiles/files/get-coin-master-cards-free_GM406889139.pdf
    • http://www.vermaagri.com/uploaded_files/userfiles/files/roblox-hack-codes_GM431946152.pdf
    • http://vermaagri.com/uploaded_files/userfiles/files/how-to-get-free-robux-2021-easy_GM431946152.pdf
    • http://www.vermaagri.com/uploaded_files/userfiles/files/how-to-cheat-in-roblox_GM431946152.pdf
    • http://vermaagri.com/uploaded_files/userfiles/files/free-minecraft-games-for-kids_GM479516143.pdf
    • http://www.vermaagri.com/uploaded_files/userfiles/files/free-robux-earn_GM431946152.pdf
    • http://vermaagri.com/uploaded_files/userfiles/files/how-to-get-minecraft-for-free-on-tablet_GM479516143.pdf
    • http://vermaagri.com/uploaded_files/userfiles/files/free-robux-cards_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054d0.bin
976b4a9358ada302581971e3a2cb7a447c9341f1c30550134312d3b5d2e34f30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54D0 26276 bytes
font_01_sfnt_off00008fc5.bin
1b98ce92e145d933014b2df21df0c7bdff4f3d576046e7717282ba2712e62279		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FC5 19332 bytes

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